This plugin allows you to syncronize your tracker files (living in ~/.TimeTracker) via git to various other computers (eg desktop machine at work and laptop).
All of the complex stuff is done by git,
this plugin is just a telling git what to do (via Git::Repository).

Turn ~/.TimeTracker into a git repository and make sure you can pull/push this repo from all your machines.
I do not recommend a public git hoster,
as the information contained in your tracking files might be rather private.